ORLANDO – Andexanet alfa, a new agent that reverses the anticoagulant effect of direct factor Xa inhibitors, showed an acceptable level of efficacy and safety in 227 patients who received the drug in the agent’s pivotal trial.
These results, which placed andexanet in the same ballpark for efficacy and safety as idarucizumab (Praxbind), approved in 2015 for reversing the anticoagulant dabigatran (Pradaxa), suggest that andexanet is likely on track for its own Food and Drug Administration marketing approval, Stuart Connolly, MD, said at the annual meeting of the American College of Cardiology.
Portola Pharmaceuticals, the company developing andexanet alfa (AndexXa) previously announced that it expected Food and Drug Administration action on its marketing application by May 2018.
Andexanet reversal “has similar efficacy and safety as seen with other reversal agents” for other types of anticoagulants, said Dr. Connolly, a professor of medicine and an electrophysiologist at McMaster University in Hamilton, Ont. In the trial results he reported, andexanet treatment of patients who were bleeding while on treatment with a direct factor Xa inhibitor had an 83% rate of hemostatic efficacy and an 11% rate of thrombotic events. By comparison, idarucizumab, the FDA-approved reversal agent for the anticoagulant dabigatran, produced a 68% hemostatic efficacy and a 6% rate of thrombotic events in the idarucizumab pivotal trial, RE-VERSE AD (N Engl J Med. 2015 Aug 6;373:511-20).